Improvement in machines for cutting screw-threads on bolts



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Witnesses wumx UNITED STATES PATENT Ormea. f

ORLANDO P. BRIGGS AND ,LEWIS W. BRIGGS, OF CHICAGO, ILLINOIS; SAID O. BRIGGS ASSIGNOR To LEWis w. sarees.

lMPROVEMENT IN MACHINES FOR CUTTING SCREWTHREDS ON BOLTS.

To all whom it may con'cam:

Be it known that we, ORLANDO P. BRIGes and LEwIs W. Bmees, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Bolt-Gutting Machines; and we do hereby declare the following to be a full, clear, and exact description thereof, which will enable others skilled in the art to which our invention appertai'ns to make and use the Same, reference being had to the accompanying drawings, forming part of this specification, in whieh- Figure 1, Plate 1, is a side elevation of a bo1t`cuttng machine embodying our invention. Fig. 2,'.Plate 1, is atop view ofthe same.` Fig. 3, Plate 2, isavertieal tra sverse section, showing those parts of the machine which are at the right hand of the `line d d,

drawn vertically through Fig. l. Fig. 4,

Plate 2, is a detached cross'seetion of the shaft carrying the dies, showing those parts which are at the right hand of the line e e, drawn vertically through Fig. 1; and Fig. 5, Plate 2, isa detached longitudinal section of said shaft, showing the respective parts connected therewith which are at the right hand of the line f f, drawn obliquely across Fig. 3.

Similar letters of reference indicate correspending parts in the several figures of the drawings.

Our invention relates to a machine for cutting threads on bolts automatically; and it consists, among other parts, of a series of revolving screw-threading dies, a revolving series of rotating bolt-holding devices, gear-wheels and mechanism to rotate said wheelsin opposite directions, and in a device for lubricating the bolts while in process of being cut.` g

In the accompanying drawings, A is the 4 frame-work, which is substantially made of Awood or metal, o both combined, and which may be arranged as shown, or may be in any suit-able form that will receive the moving parts of the machine.

Mounted upon the upper side ot' the frame is the main shaft, which is made in two separate sect-ions, l; anlT.l The bearings ot` section B are secured within boxes. a a, atlixed to the cross-girts of the frame; and the bearing of section R' is also secured at. one end in a like manner within a box, aallxed to asimilar cross-girt of the frame. land its bearing at the opposite end is secured to andwitliin the end of section B, the whole of which isso arranged as to. admit of an opposite rotating movement of the separate sectionsr Axed upon section B', near its outer end, is a disk, O, which is' so arranged as to admit of being moved thereon longitudinally, and can be firmly secured at any adjusted point by means of set-screws passing through its hub to and against the shaft.` Secured to the periphery of said disk is a system of arms, D, which are provided with a groove or recess ex tending` inward toward the axis ofthe disk, within which grooves are arranged the espective die-plateslt and E. The die-'plates E are so arranged as to admit of. being moved toor from the center-of the disk, and rigidly secured at any desired point by means of a set-screw, b, passing through the same, the ob ject being to adjust the dies to the differentsized bolts. The said die-plates E are also arranged or litted within the grooves in a manner which admits of a free and easy sliding movement, and are secured firmly against the die-plate E', when closed, by means of a hook', F, pivoted to and within the arm in such a manner as toengage the outer extremity of the said die-plate. y.

Firm'ly attached tothe base of the frame is a vertical upright, G, which extends upward to or slightly above the'center or axis ot the disk. The upper and inner portion of said upright is concaved approximating the Acircle described by the rotation of the arms. To the said coucaved surface are lfirmly atixed inclined lugs g g, as shown 'by' dotted lines, Fig. 1,'which are so arranged as to alternately en= gage the outer extremity of the respective hooks as the disk is rotated, by which means the said hooks are engaged with or disengaged from the respective dies. The said upright is provided, upon' its side toward the center ot the machine, with a tlange, II, arranged at a right angle toits concavcd snrthco, and npon which is also scoured nu int-lined lng, It, sonrranged as to t'orin n vnrrt-d or inclined groove, into und through which pass' pivots /l, ntlxod to the dio-platos IG, ns said disk is rotated, the arl'n-ngcnn-nt ot' thel snid groove tningsnrh as to more the die-platesl if) outward ns the hook F is disengaged therefrom, whereby the bolt ing pinion,

p Secured upon each ot'suid is discharged from the dies; also, to force the said dies inward simultaneously with the engaging of the hook therewith. The said upright is'so afxed to vthe base of the frame as to admit of being moved to any desired point laterally with the frame or in the direction lof its length, the object being to change its position to agree with the dies when said dies are adjusted to cnt different sizes and lengths of bolts. f

Firmly afxed to and upon section B of the main shaft, at its end opposite to the disk, is 1 gear-wheel, J, which engages a correspond- J', on the driving-shaftK. Attached to said wheel J, near its periphery, is an annular rim', L, which rim'niay be formed as a part of the said wheel, or may be `made separately and properly bolted thereon. 'Vithin said wheel J and rim L of the same are loosely secured primary shafts M, which are respectively arranged horizontally in the same plane with the separate dies. The ends of said primary shafts toward thedies are screwthreaded, upon which Ais secured a disk, which is provided internally with a socket, i', to receive the bolt-head. Firmly aiiixed to said wheel, near its axis, are arms j, to which are pivoted levers N, extending out: Iward' slightly beyond the periphery of the. wheel, and through which the said primary shaftsM pass. Secured tothe said levers, bctween 'shaft M and arm j, are spiral springs m, so arran'ged as to be in contact with and against the face of the wheel carrying the le; vers, by which means the said levers and primary shafts are forced outward to the proper point topintro'duce the bolt-head into the disk of the said primary shafts, which is so arranged as to secure the said levers i n proper adj ustment.

Firmly secured to the side ofthe base of the frame, in a line laterally with the levers N, is a vertical upright,0,which extends upward to or slightly above the cent' or axis of the wheel. The inner side of lsaid upright is concaved approximating the circle described by the ou ter extremities of thelle'vcrs as the sume are rotated by the wheel. Upon thesai'd neared surface is firmly secured an inclined or wedge-shaped lug, Z, as'shown in Fig.v l,which is so arranged as to engage its inclined surface with the outer extremities ofthe levers as the wheel is rotated, by which means thev 'respective primary shafts are moved longitmlinally from the disk, the arrangeluentof the sha ftsandconnection with the vlevers being` such as to admit of tho movement.

primary shafts, bctween their bearings, isa gear-pinion, onwhich engages a corresponding gear-wheel, l, on thccndofthe section B of .the main shaft. Thus, as wheel J'is rotated bythe action of the drivingshat't, an independent rotating movement is imparted to the primary shafts. Said primary shafts are each provided with a longitudinal groove or key-seat, which receives a featherkey secured within the pinion, by which means the shaft is allowed a free and easy longitudinal movement as tlie'same is'rotated by the ac- .tion ofthe pinion. i

Firmly laiiixed to the sidesvot the separate uprights G and O are horizontalarms pp, eX-

tending inward toward the center' of the maA chine, upon theinner ends of which are formed curved reeesses't t, which are arranged in a line with the circle described by the rotation of thel dies and primary shafts, and into which recesses the bolts are placed preparatory to being fed into the machine.

l Atlixed on section B of the main shaft is wheel, It, corresponding with allke Wheel, R

thev same being made Ahollow to receive said tube'. To the said tube U is aiiixed a corresponding tube, V, which extends outward to the periphery of the disk through a slot or mortise, r, cut through section B'. To the outer extremities of said tubes V is attached an annular tube,W', secured tothe face of the disk,

around and near its periphery. NVithin 'this annular tube we provide a series of apertures, so arranged as to allow the oil from the cask to enter and pass through the respective tubes to -and upon the dies,by which means thebolts are properly lubricated while in process of being cut.

The operation of our machine is as follows:

The operator places the bolt wit-hin the rcecsses ofthe arms p p, with the head toward wheel J motion being imparted to said wheel vby the rotation of pinion J of driving-shaft l\.,which brings the outer end of lever N in contact with the inclined surface of lug Z of npri ght- O, forcing disk 1 of primary sha-ft M backward toward wheel .Lwhich allows-said disk to moveto and in linel horizontally 'with the bolt. Lever N then being passed, lug Z and sp ri ng mforce the primary shaft and disk back toits normal position, by which means the bolthend is forced into socket i. The outer en d of said lever is ihen brought in contact with and against the side of arm .\'v of upright O, forcing the opposite end ol the boltintothedies. An independent rotating movement is imparted to the bolt as thesame is revolved, together with wheel J and disk (i, bythe rotating motion of pinion n ol' the primary shaft, communicated thereto by ille opposite rotating motion of wheel l on section .l ofthe main sha fi,by which means the thread Yiscut on the bolt, the distance the thread is cut on the bolt from iis end being graduated by the number ofrc\-'ohu1ions ofthe prinmry shafts, said bolts being respect- We do-not wish to confine ourselves tothe j ively discharged from the dies as the said dieplateE is moved outward by pivot h passing through the inclined groove of upright G, whereby a continuous motion of the machine is obtained. l

Having thus described the nature and object of ou'r invention, what We claim as new.y and desire to secure by Letters Patent, is-

1. The combination of the jointed shafts B of rotating bolt-holding devices, of the revolvi ing disk C, seriesl of screw-threading dies li E', hooks F, pins h, andlugs g g,substant1a1ly as described.

4. In combination with the subject-matter of the third claim, thearmspp, for supporting the bolt-blank, substantially as described.

5. In combination with disk C, the annular tu be NV, tubes V'a a', and cask T, the Whole arranged as described for lubricating the bolt substantially as specified.

The foregoing specification vsigned by us this 28th day of February, 1-871.

ORLANDO P. BRIGGS. LEVIS BRIGGS.

Witnesses: y

N. GRIDLEY,

N. H. SHERBURNE. 

